A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint Overrides
GOOGLE_CLOUD_CPP_OS_LOGIN_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "oslogin.googleapis.com") used by MakeOsLoginServiceConnection().
GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.
See Also
google::cloud::LoggingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
See Also
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-05-07 UTC."],[[["This document provides version-specific documentation for the OS Login C++ library, with version 2.37.0-rc being the latest release candidate and 2.34.0 being the current version displayed."],["Environment variables, such as `GOOGLE_CLOUD_CPP_OS_LOGIN_SERVICE_ENDPOINT`, `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, can be utilized to configure the library's behavior, especially for troubleshooting."],["The library supports detailed gRPC tracing via `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, which can be further customized with `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, offering control over log output formatting."],["The `GOOGLE_CLOUD_CPP_ENABLE_CLOG` environment variable enables logging in the library, directing the logging infrastructure to print to the program's console, though it has no output unless enabled."],["The `GOOGLE_CLOUD_PROJECT` environment variable is available to configure the GCP project in examples and integration tests."]]],[]]
